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Collapse Performance of Nominally Identical Nonductile Circular Columns Susceptible to Failure-Mode Variability

机译:崩溃性能的名义上相同的导网圆柱易受破坏模式变异性的影响

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摘要

Recent analytical studies have highlighted the existence of a failure-mode transition zone within which nominally identical test specimens may experience variability in failure mode between a flexure-dominated and a shear-dominated mechanism. This paper presents a study on the seismic response of four nominally identical nonductile RC circular columns susceptible to failure-mode uncertainty designed to represent typical New Zealand pre-1995 poorly detailed gravity columns. In this study, the influence of inherent material uncertainty and displacement history on the collapse response of the nominally identical columns was investigated. Experimental results showed that the failure mode of lightly confined RC columns can be influenced by displacement history and inherent material uncertainty. As observed in this study, the nominally identical columns experienced different failure modes, even under the same loading protocol, leading to a significant variation in drift capacity at axial failure (ranging from 1.5% to 2.6%) and residual axial capacity of RC columns (ranging from 200 to 650 kN). (C) 2021 American Society of Civil Engineers.
机译:最近的分析研究突出显示失败模式过渡区的存在,其中标称相同的测试样本可能在弯曲主导地和剪切主导机构之间经历故障模式的变化。本文介绍了四个名义相同的否定型RC圆柱的地震响应的研究,易于失败模式不确定性,旨在代表典型的新西兰预1995年的重心柱。在这项研究中,研究了固有的材料不确定性和位移史对标称相同列的崩溃响应的影响。实验结果表明,轻局历史和固有材料不确定性的近距离狭窄的RC柱的故障模式可能受到影响。如本研究所述,即使在相同的加载协议下,标称相同的柱也经历了不同的故障模式,导致轴向故障(范围为1.5%至2.6%)和RC柱的残留轴向容量的显着变化(从200到650 kN范围内。 (c)2021年美国土木工程师协会。

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  • 来源
    《Journal of structural engineering》 |2021年第6期|04021069.1-04021069.16|共16页
  • 作者单位

    Univ Auckland Dept Civil & Environm Engn Auckland 1010 New Zealand;

    Univ Auckland Dept Civil & Environm Engn Auckland 1010 New Zealand;

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  • 正文语种 eng
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